Magnetorheological fluids

© Fraunhofer IWM

Maximizing torque transmission in magnetorheological clutches#

 

Magnetorheological fluids (MRF) consist of magnetizable solid particles in carrier fluid. When applying an external magnetic field the particles become magnetized and form chains along the field lines. As a result, the MRF changes within milliseconds from a liquid to a solid state. This is very useful for targeted industrial applications, for example, clutches, shock absorbers and brakes. At the Fraunhofer IWM, MRF are modeled under real-life operating conditions at the particle level. In this way, a detailed and in-depth understanding of the MRF mechanisms at work is achieved, which allows the properties of the particles to be specifically optimized, in essence tailoring them to the desired application.

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Publications#

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  • Mohseni Mofidi, S., Bierwisch, C., SPH simulations of magnetorheological abrasive flow machining at a microscopic scale, in Proc. of International Congress on Particle Technology - PARTEC 2019; Heinrich, S. (Hrsg.); VDI Wissensforum GmbH, Düsseldorf (2019) 4 Seiten Link
  • Shahrivar, B.; Morillas, J. R.; Luengo, Y.; Gavilan, H.; Morales, P.; Bierwisch, C.; de Vincente, J., Rheological behavior of magnetic colloids in the borderline between ferrofluids and magnetorheological fluids, Journal of Rheology 63/4 (2019) 547-558 Link
  • Lagger, H.; Breinlinger, T.; Di Renzo, A.; Di Maio, F. P.; Korvink, J.; Moseler, M.; Bierwisch, C.; Influence of hydrodynamic drag model on shear stress in the simulation of magnetorheological fluids; Journal of Non-Newtonian Fluid Mechanics 218 (2015) 16-26 Link